Yes... but imagine mods or TCs with beams that AREN'T that powerful and yet still look cool.
Actually, they do affect the momentum, but not forward -- it kind of goes 'sideways' like a baseball bat. Only noticeable on small ships though. However I tested a change that made forward momentum work... and with negative numbers, a tractor beam

Working on this

All that said... I do think a 'hybrid' beam, probably a new type, could be created, that behaves somewhat like a slash beam and does 'track' the target.
And Getter -- granted I've only seen Gunbuster scenes on Youtube... but the curved beam bit, isn't it being affected by the moon's gravity because of such a huge (light-minutes) distance/scale?